English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

It is well known that even in a compatible relation between rice variety and race of rice blast fungus (Pyricularia oryzae Cav.), the lower senescent leaves are quite resistant to this fungus. One of the authors indicated that the increase of mechanical resistance of vein cell-walls with aging could partly be related with such resistance (general resistance)1). While, the limiting of fungal growth by anti-blast substances accumulated in leaves with senescence was also postulated. It has been reported that momilactones, dormant factors of rice seed2,3), showed anti-blast activity4,5) and existed in rice leaves5). To clarify the participation of these momilactones to the resistance, the detection and quantitative estimation of these substances in the leaf were carried out by GLC. However, the authors could not find any momilactones in rice leaves of four varieties infected, non-infected and aged6). During the experiment for the detection of momilactones, an anti-blast substance which resembles partially with the momilactones was detected in the petroleum ether extracts from inoculated leaves. The abstract was already reported elsewhere7) and the details will be appeared in this report. Rice variety Inabawase (resistance gene: Pi-i) was raised as stated before6). At 6th leaf stage the seedlings were spray-inoculated with spore suspension of isolate Ken 5333 (race 137) of Pyricularia oryzae Cav. Typical susceptible lesions appeared on 6th leaves (uppermost leaves) and resistant lesions (brown dots and small lesions) mixedly appeared on 5th leaves. While, brown dots were mainly observed on 4th leaves. Seven days after inoculation, 6th, 5th and 4th leaves were collected, respectively. Each 3g of the leaves was scissored and kept in 100ml of 70% hot methanol for 3min. Then the

On an antifungal substance mainly accumulated in lower rice leaves infected with rice blast fungus Pyricularia oryzae Cav.